... The twentymile park district of the Yamps coal field, Routt county, Colorado,
Campbell, Marius R. 1858-1940.
The twentymile park district of the Yamps coal field, Routt county, Colorado, by Marius R. Campbell. - Washington, Govt. Print. Off., 1923. - iv, 82 p. XIII pl. (part. fold.; incl. map. diagrs.) tables, diagrs. 23 cm. - U.S. Geological survey. Bulletin 748 .
At head of title: Department of the Interior. Map folded in pocket.
gs 23000261
Coal--Colorado--Routt County.
QE75 / .B9 no. 748
The twentymile park district of the Yamps coal field, Routt county, Colorado, by Marius R. Campbell. - Washington, Govt. Print. Off., 1923. - iv, 82 p. XIII pl. (part. fold.; incl. map. diagrs.) tables, diagrs. 23 cm. - U.S. Geological survey. Bulletin 748 .
At head of title: Department of the Interior. Map folded in pocket.
gs 23000261
Coal--Colorado--Routt County.
QE75 / .B9 no. 748